WO2022202472A1 - 流体圧緩衝器 - Google Patents
流体圧緩衝器 Download PDFInfo
- Publication number
- WO2022202472A1 WO2022202472A1 PCT/JP2022/011525 JP2022011525W WO2022202472A1 WO 2022202472 A1 WO2022202472 A1 WO 2022202472A1 JP 2022011525 W JP2022011525 W JP 2022011525W WO 2022202472 A1 WO2022202472 A1 WO 2022202472A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rod
- damping
- side chamber
- resistance
- cylinder tube
- Prior art date
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 79
- 230000035939 shock Effects 0.000 title claims abstract description 79
- 239000012530 fluid Substances 0.000 title claims abstract description 45
- 238000013016 damping Methods 0.000 claims abstract description 123
- 238000005192 partition Methods 0.000 claims abstract 2
- 238000004891 communication Methods 0.000 claims description 24
- 239000010720 hydraulic oil Substances 0.000 description 21
- 230000008602 contraction Effects 0.000 description 7
- 230000004308 accommodation Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/06—Characteristics of dampers, e.g. mechanical dampers
- B60G17/08—Characteristics of fluid dampers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/062—Bi-tubular units
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/063—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid comprising a hollow piston rod
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
- F16F9/516—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics resulting in the damping effects during contraction being different from the damping effects during extension, i.e. responsive to the direction of movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2500/00—Indexing codes relating to the regulated action or device
- B60G2500/10—Damping action or damper
- B60G2500/11—Damping valves
- B60G2500/112—Fluid actuation
Definitions
- the present invention relates to a fluid pressure damper.
- the piston rod is connected to a rod portion extending to the outside of the cylinder and an end portion of the rod portion to move slidably in the cylinder, It has a piston partitioned into a bottom side chamber and a rod side chamber.
- the rod part is replaceable with a rod inner space formed inside the rod part and communicating with the bottom side chamber of the cylinder, a first communication passage connecting the rod inner space and the rod side chamber of the cylinder, and a first communication passage. and an orifice plug provided.
- the fluid pressure damper described in JP2015-206374A is configured to generate a damping force with a compact structure by providing an orifice plug in the first communication passage formed in the rod portion.
- An object of the present invention is to provide a fluid pressure damper that can secure an installation space for a damping section.
- a fluid pressure damper includes a cylinder tube, a piston rod that is inserted into the cylinder tube so as to move back and forth, and a piston rod that is connected to the piston rod to divide the inside of the cylinder tube into a rod-side chamber and a bottom-side chamber.
- a piston and a damping section that generates a damping force by applying resistance to the flow of the working fluid between the rod-side chamber and the bottom-side chamber, the piston rod being connected to the piston and sliding on the cylinder tube. It has a freely supported rod portion and a head portion connected to the rod portion and exposed to the outside of the cylinder tube, and the damping portion is provided at the head portion of the piston rod.
- FIG. 1 is a cross-sectional view of a shock absorber according to a first embodiment of the invention.
- FIG. 2 is an enlarged sectional view showing the structure around the head portion of the shock absorber according to the first embodiment.
- FIG. 3 is a configuration diagram schematically showing a damping section according to a modification of the first embodiment.
- FIG. 4 is a cross-sectional view of the shock absorber according to the second embodiment.
- FIG. 5 is a configuration diagram schematically showing the damping section of the second embodiment.
- FIG. 6 is a configuration diagram schematically showing a damping section according to a modification of the second embodiment.
- FIG. 1 A fluid pressure damper according to a first embodiment will be described with reference to FIGS. 1 and 2.
- FIG. A case where the fluid pressure damper is the shock absorber 100 mounted on the vehicle will be described below.
- the shock absorber 100 is, for example, a device that is interposed between the vehicle body and the axle of the vehicle to generate a damping force to suppress the vibration of the vehicle body.
- the shock absorber 100 includes a cylindrical cylinder tube 10, a piston rod 20 inserted into the cylinder tube 10 so as to move back and forth and extending to the outside of the cylinder tube 10, and a and a piston 30 that is connected and moves slidably along the inner peripheral surface of the cylinder tube 10 .
- the shock absorber 100 is mounted on the vehicle with the cylinder tube 10 facing upward and the piston rod 20 facing downward.
- the inside of the cylinder tube 10 is divided into a bottom side chamber 1 and a rod side chamber 2 by the piston 30 .
- the bottom-side chamber 1 and the rod-side chamber 2 are each filled with hydraulic oil as a hydraulic fluid.
- the bottom side chamber 1 is filled with gas together with hydraulic oil to obtain a spring action by utilizing the change in volume inside the cylinder tube 10 as the piston rod 20 moves into and out of the cylinder tube 10. be done.
- the shock absorber 100 is a fluid pressure damper having an air suspension function capable of supporting the vehicle body by the spring action of gas. In this case, the damping force can be generated and the vehicle body can be supported by the shock absorber 100 without providing a separate spring for supporting the vehicle body.
- the cylinder tube 10 does not have to be filled with gas.
- a free piston may be provided which is movably provided inside the bottom side chamber 1 and separates the bottom side chamber 1 into a liquid chamber filled with working oil and an air chamber filled with gas.
- the piston 30 is configured to face the liquid chamber.
- the cylinder tube 10 is a cylindrical member with a bottom, and its open end is closed by a cylinder head 11 through which the piston rod 20 is slidably inserted.
- the cylinder head 11 is fixed to the cylinder tube 10 by being fastened to the end of the cylinder tube 10 with a bolt (not shown).
- the inner peripheral surface of the cylinder head 11 is provided with a seal member (not shown) and a dust seal (not shown) which are in sliding contact with the outer peripheral surface of the piston rod 20 .
- a mounting portion 10a for mounting the shock absorber 100 to the vehicle is provided at the closed end of the cylinder tube 10 (the end opposite to the cylinder head 11).
- the piston rod 20 includes a rod portion 21 connected to the piston 30 and slidably supported by the cylinder head 11 of the cylinder tube 10, a head portion 23 exposed to the outside of the cylinder tube 10, and provided inside the rod portion 21. and a pipe portion 27 as a flow passage portion.
- the rod portion 21 is formed with a concave portion 21a that opens to the end face on the piston 30 side. Inside the rod portion 21, a rod inner chamber 2a is formed as a rod inner space by the concave portion 21a. The end of the rod portion 21 is connected to the piston 30 with a bolt (not shown).
- the head portion 23 has a larger diameter than the rod portion 21, and is always exposed to the outside of the cylinder tube 10 regardless of the expansion/contraction state of the shock absorber 100 (in other words, the stroke position of the piston rod 20 with respect to the cylinder tube 10). . From another point of view, the head portion 23 is a portion of the piston rod 20 that does not slide with respect to the cylinder head 11 .
- the head portion 23 is formed separately from the rod portion 21, for example, and is connected to the end portion of the rod portion 21 by a method such as welding.
- the rod part 21 and the head part 23 are not limited to the configuration in which they are separately formed and connected, and may be integrally formed.
- the head portion 23 is provided with a stopper portion 24 that defines the stroke end during contraction of the shock absorber 100, and an attachment portion 20a for attaching the shock absorber 100 to the vehicle.
- the stopper portion 24 is provided with an annular cushion ring 15 that prevents collision between the cylinder head 11 and the piston rod 20 at the stroke end when the shock absorber 100 is contracted.
- the pipe portion 27 is a cylindrical pipe member having a through hole 27a formed along the axial direction.
- a through hole 27 a of the pipe portion 27 communicates with the bottom side chamber 1 through a piston passage 31 formed in the piston 30 .
- One end of the pipe portion 27 is inserted into an insertion hole 23a formed in the head portion 23, and the other end is inserted into an insertion hole 30a formed in the piston 30.
- the pipe portion 27 is provided so as to be sandwiched between the head portion 23 and the piston 30 .
- O-rings (not shown) are provided to seal the gaps.
- the rod inner chamber 2 a is formed as an annular space by the outer peripheral surface of the pipe portion 27 , the inner peripheral surface of the rod portion 21 , the head portion 23 and the piston 30 .
- the rod inner chamber 2 a communicates with the rod side chamber 2 through a plurality of first communication passages 22 formed in the rod portion 21 of the piston rod 20 .
- the plurality of first communication passages 22 are arranged in the circumferential direction of the rod portion 21 so as to open to the inner and outer peripheral surfaces of the rod portion 21 , and are formed so as to penetrate the rod portion 21 in the radial direction.
- the hydraulic oil in the rod inner chamber 2a is quickly led to the rod side chamber 2 when the shock absorber 100 is retracted at high speed or when it is retracted from the maximum extension state. Thereby, a rapid pressure drop in the rod side chamber 2 is suppressed.
- the shock absorber 100 further includes a damping portion 50 that applies resistance to the flow of hydraulic oil between the rod-side chamber 2 and the bottom-side chamber 1 to generate a damping force.
- the damping portion 50 is provided inside the head portion 23 of the piston rod 20 .
- the head portion 23 has a housing hole 40 housing the damping portion 50, a connection hole 45 communicating the housing hole 40 and the through hole 27a of the pipe portion 27, Second communication paths 46a and 46b communicating with the chamber 2a are formed.
- the bottom side chamber 1 and the rod side chamber 2 are defined by a piston passage 31 (see FIG. 1), a through hole 27a of the pipe portion 27, a connection hole 45, an accommodation hole 40, second communication passages 46a and 46b, a rod inner chamber 2a, and a rod inner chamber 2a. They communicate with each other through a channel constituted by one communication channel 22 (see FIG. 1).
- the shock absorber 100 is of a so-called internal piping type, in which the flow path communicating between the bottom side chamber 1 and the rod side chamber 2 is provided inside the shock absorber 100 .
- the shock absorber 100 may be of a so-called external piping type in which a part of the flow path communicating between the bottom side chamber 1 and the rod side chamber 2 is provided outside the shock absorber 100 .
- the damping section 50 has a first resistance section 51 and a second resistance section 60 that provide resistance to the flow of hydraulic oil.
- the first resistance portion 51 applies resistance only to the flow of hydraulic oil from the bottom side chamber 1 to the rod side chamber 2 .
- the first resistance portion 51 includes a first orifice 52 as a first throttle portion that applies resistance to the passing hydraulic fluid to generate a damping force, and a flow of hydraulic fluid from the bottom side chamber 1 to the rod inner chamber 2a. and a check valve 55 that allows only
- the second resistance portion 60 provides resistance to both directions of the hydraulic oil flow between the bottom side chamber 1 and the rod side chamber 2 .
- the second resistance portion 60 has a second orifice 61 as a second throttle portion that applies resistance to the passing hydraulic oil to generate a damping force.
- the first resistance section 51 and the second resistance section 60 are provided in parallel with each other, as shown in FIG.
- a check valve 55 is provided at a position closer to the bottom side chamber 1 than the first orifice 52 in the flow of hydraulic fluid.
- the damping portion 50 is housed in the housing hole 40 formed in the head portion 23 of the piston rod 20 and provided inside the head portion 23 .
- the damping section 50 has a first orifice plug 53 provided with a first orifice 52 and a second orifice plug 62 provided with a second orifice 61 .
- the accommodation hole 40 of the head portion 23 includes a first accommodation portion 41 that accommodates the first orifice plug 53 and the check valve 55, a second accommodation portion 42 that accommodates the second orifice plug 62, and a first accommodation portion 41. and a communication portion 43 that communicates with the second housing portion 42 .
- the first housing portion 41 and the second housing portion 42 are opened to the outer surface of the head portion 23 , and the respective openings are sealed with plugs 80 and 81 .
- the check valve 55 has a ball body 56 as a valve body and a seating portion 57 on which the ball body 56 is seated.
- the seat portion 57 is formed in a stepped portion formed between the first housing portion 41 and the communication portion 43 .
- the ball body 56 is seated on the seat portion 57 to block the flow of hydraulic oil from the first accommodation portion 41 to the communication portion 43 .
- the head portion 23 is formed with second communicating passages 46a and 46b that communicate the rod inner chamber 2a with the first accommodating portion 41 and the second accommodating portion 42. As shown in FIG.
- One of the second communicating passages 46 a is formed to open to the first accommodating portion 41 between the first orifice plug 53 and the plug 80 that seals the opening of the first accommodating portion 41 .
- the other second communication path 46 b is formed to open to the second housing portion 42 between the second orifice plug 62 and the plug 81 that seals the opening of the second housing portion 42 .
- the first orifice plug 53 is provided between the second communication passage 46a on one side and the communication portion 43
- the A second orifice plug 62 is provided between the second communicating passage 46 b and the communicating portion 43 .
- the shock absorber 100 when the shock absorber 100 is contracted, the hydraulic fluid in the bottom side chamber 1 passes through both the first orifice 52 and the second orifice 61 and is led to the rod side chamber 2 . Therefore, in the shock absorber 100, a damping force corresponding to the flow path resistance exerted by the first orifice 52 and the second orifice 61 as a whole is generated.
- the shock absorber 100 contracts relatively smoothly, and then generates a large damping force when extending, and the shock absorber 100 extends from the road surface to the vehicle body. Effectively attenuates input vibrations.
- the damping portion 50 is provided inside the head portion 23 of the piston rod 20.
- the volume of the head portion 23 can be easily secured compared to the rod portion 21, and accordingly, the installation space for the damping portion 50 can be easily secured. Therefore, even if the damping section 50 has a relatively complicated configuration or a large configuration, it can be easily incorporated into the shock absorber 100 . As a result, the shock absorber 100 can achieve various damping characteristics.
- the shock absorber 100 since the damping portion 50 is provided in the head portion 23 of the piston rod 20 which is always exposed to the outside of the cylinder tube 10, compared with the case where the damping portion 50 is provided in the rod portion 21 or the piston 30, the shock absorber 100 can be adjusted without disassembling the Specifically, by removing the plugs 80 and 81 exposed to the outside and replacing the first orifice plug 53 and the second orifice plug 62, the damping characteristics of the shock absorber 100 can be easily changed.
- the first orifice 52 and the second orifice 61 are fixed orifices with constant flow resistance.
- the first orifice 52 and/or the second orifice 61 may be variable orifices (variable restrictors) having variable flow path resistance.
- shock absorber 100 has second orifice 61a, which is a variable orifice, so that the damping force of shock absorber 100 can be adjusted more easily.
- the configuration of the variable orifice and its adjustment mechanism will not be described or illustrated because a known configuration can be adopted. be done.
- the first resistance portion 51 applies resistance only to the flow of hydraulic oil from the bottom side chamber 1 toward the rod side chamber 2 .
- the shock absorber 100 has different damping characteristics during the extension operation and during the contraction operation.
- the first resistance portion 51 may provide resistance only to the flow of hydraulic oil from the rod-side chamber 2 toward the bottom-side chamber 1 .
- the first resistance portion 51 applies resistance only to the flow of hydraulic fluid from the bottom side chamber 1 to the rod side chamber 2, and the second resistance portion 60 only resists the flow of hydraulic fluid from the rod side chamber 2 to the bottom side chamber 1. may be given. In this case, it is desirable that the first orifice 52 and the second orifice 61 have different attenuation characteristics.
- the configuration in which the damping portion 50 has the first resistance portion 51 and the second resistance portion 60 provided in parallel with each other is not essential, and the damping portion 50 can Any configuration is possible.
- the damping section 50 may generate damping force with the same damping characteristics for expansion and contraction of the shock absorber 100 .
- a shock absorber 200 according to a second embodiment will be described with reference to FIGS. 4 and 5.
- FIG. the points different from the first embodiment will be mainly described, and the same reference numerals will be given to the same configurations as in the first embodiment, and the description thereof will be omitted as appropriate.
- the shock absorber 200 according to the second embodiment differs from the shock absorber 100 according to the first embodiment in the configuration of the damping portion 150 .
- the damping portion 150 of the shock absorber 200 according to the second embodiment includes a first resistance portion 51 and a second resistance portion 160 which are provided in parallel, as in the first embodiment. , has
- the configuration of the first resistor portion 51 is the same as that of the first embodiment, so the description is omitted.
- the second resistance section 160 has a damping valve 161 that changes the resistance applied to the flow of hydraulic oil passing through it according to its position.
- the damping valve 161 has a first throttle position 161A that imparts a predetermined resistance to the flow of hydraulic fluid passing therethrough, and a resistance that is different in magnitude from the resistance imparted by the first throttle position 161A. and a second aperture position 161B to provide. That is, the first throttle position 161A and the second throttle position 161B have different pressure loss characteristics with respect to the flow of hydraulic oil passing therethrough.
- the damping valve 161 has a valve body (not shown) that switches positions, and a spring 162 as a biasing member that biases the valve body. In the damping valve 161, the valve body is biased by a spring 162 so as to reach the first throttle position 161A.
- the damping portion 150 also has a switching portion 165 that is pressed by the cylinder tube 10 as the piston rod 20 enters the cylinder tube 10 to switch the position of the damping valve 161, as shown in FIG.
- the switching portion 165 has a lever portion 166 protruding outside the piston rod 20 and a pressing rod portion 167 that presses the valve body as the lever portion 166 is switched. At least part of the pressing rod portion 167 is inserted into the head portion 23 of the piston rod 20 .
- the cylinder head 11 of the cylinder tube 10 is provided with a projecting portion 120 for switching the lever portion 166 .
- the stroke area of the piston rod used may differ depending on the conditions of the object such as the vehicle or equipment to which the shock absorber is attached. That is, for a certain shock absorber, both a situation in which the shock absorber expands and contracts in a relatively expanded state and a situation in which the shock absorber expands and contracts in a relatively contracted state may occur.
- the stroke region of the shock absorber differs between a state in which a vehicle is loaded with a load such as a person or luggage and a state in which the vehicle is not loaded. In such a case where the stroke area varies depending on the situation, it is desirable to configure the damping characteristics of the shock absorber to differ according to the stroke area.
- the damping valve 161 of the damping section 50 assumes the first throttle position 161A by the biasing force of the spring 162, as shown in FIGS. Therefore, when the shock absorber 100 expands and contracts in the extended state, a damping force is generated based on the damping characteristic corresponding to the pressure loss characteristic of the first throttle position 161A.
- damping portion 150 is provided in head portion 23, so damping portion 150 can be easily incorporated into shock absorber 100 even with a complicated configuration including damping valve 161, switching portion 165, and the like. be able to.
- the pressure loss characteristic of the first throttle position 161A of the damping valve 161 is configured so as to generate a damping characteristic suitable for the shock absorber 100 in the extended state
- the pressure loss characteristic of the second throttle position 161B is configured to be suitable for the shock absorber 100. It can be configured to generate suitable damping characteristics when 100 is in a contracted state. As a result, an appropriate damping force can be generated according to the condition of the object to which the shock absorber 100 is attached.
- the lever portion 166 is in direct contact with the projection portion 120 of the cylinder tube 10 and is pressed against the projection portion 120.
- the lever portion 166 may be pressed by the magnetic force (repulsive force) of . That is, the switching portion may be configured to be switched by being pressed by the cylinder tube 10 in a non-contact manner.
- the damping portion 150 has the switching portion 165 that is pressed by the cylinder tube 10 as the piston rod 20 enters the cylinder tube 10 to switch the position of the damping valve 161 .
- the shock absorber 200 generates a damping force with different damping characteristics in a relatively expanded state and a contracted state.
- the solenoid portion 265 moves the valve element of the damping valve 161 against the biasing force of the spring 162 by receiving an electric signal from the controller 90 . As a result, the position of the damping valve 161 is switched from the first throttle position 161A to the second throttle position 161B. When the solenoid portion 265 is de-energized, the damping valve 161 is switched to the first throttle position 161 A by the biasing force of the spring 162 .
- the damping characteristic of the damping valve 161 is not limited to the stroke range of the piston rod 20, and can be applied even in various other situations. can be changed.
- the damping characteristic can be changed according to the steering operation of the vehicle and the running state of the vehicle such as road surface conditions. In this manner, the damping characteristics of shock absorber 200 can be changed at any timing, thereby improving convenience.
- the shock absorbers 100 and 200 include a cylinder tube 10, a piston rod 20 that is inserted into the cylinder tube 10 so as to move back and forth, and a piston connected to the piston rod 20 that divides the inside of the cylinder tube 10 into a rod-side chamber 2 and a bottom-side chamber 1. 30, and damping portions 50, 150, and 250 that generate damping force by providing resistance to the flow of the working fluid between the rod side chamber 2 and the bottom side chamber 1. and a head portion 23 exposed to the outside of the cylinder tube 10 . It is provided in the part 23 .
- the piston rod 20 has a rod inner chamber 2a formed inside the rod portion 21, and a first communication passage that guides hydraulic fluid between the rod side chamber 2 and the rod inner chamber 2a. 22, and second communication passages 46a, 46b for guiding hydraulic fluid between the rod inner chamber 2a and damping portions 50, 150, 250. 1 and the damping portion 50,150,250.
- the installation space for the damping units 50, 150, 250 is secured even in the case of a so-called internal piping type in which the flow path communicating between the bottom side chamber 1 and the rod side chamber 2 is provided inside the shock absorbers 100, 200. can do.
- the damping portions 50, 150, 250 each have a first resistance portion 51 and second resistance portions 60, 160, 260 that impart resistance to the flow of the working fluid.
- 1 resistance part 51 gives resistance only with respect to the flow of the hydraulic oil which goes from one of the rod side chamber 2 and the bottom side chamber 1 to the other.
- the damping portion 50 has a second orifice 61a that provides variable resistance to the flow of hydraulic oil passing therethrough.
- the damping portion 150 includes the damping valve 161 that changes the resistance applied to the working fluid according to the position, and and a switching portion 165 that is pressed by the cylinder tube 10 to switch the position of the damping valve 161 .
- shock absorber 200 can generate an appropriate damping force according to the stroke.
- the damping portion 250 includes the damping valve 161 that changes the resistance applied to the working fluid according to the position, and the damping valve 161 driven by energization to change the position of the damping valve 161. and a switching solenoid portion 265 .
- the damping force generated by the damping valve 161 can be adjusted at any timing by energizing the solenoid portion 265, which improves convenience.
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
図1及び図2を参照して、第1実施形態に係る流体圧緩衝器について説明する。以下では、流体圧緩衝器が車両に搭載されるショックアブソーバ100である場合について説明する。
次に、図4及び図5を参照して、第2実施形態に係るショックアブソーバ200について説明する。以下では、上記第1実施形態と異なる点を中心に説明し、上記第1実施形態と同一の構成には同一の符号を付して説明を適宜省略する。具体的には、第2実施形態に係るショックアブソーバ200は、減衰部150の構成が第1実施形態に係るショックアブソーバ100と相違する。
Claims (6)
- 流体圧緩衝器であって、
シリンダチューブと、
前記シリンダチューブに進退自在に挿入されるピストンロッドと、
前記ピストンロッドに連結され前記シリンダチューブ内をロッド側室とボトム側室とに区画するピストンと、
前記ロッド側室と前記ボトム側室との間の作動流体の流れに対して抵抗を付与して減衰力を発生する減衰部と、を備え、
前記ピストンロッドは、
前記ピストンに連結され前記シリンダチューブに摺動自在に支持されるロッド部と、
前記シリンダチューブの外部に露出するヘッド部と、を有し、
前記減衰部は、前記ピストンロッドの前記ヘッド部に設けられる流体圧緩衝器。 - 請求項1に記載の流体圧緩衝器であって、
前記ピストンロッドには、前記ロッド部の内部に形成されるロッド内空間と、前記ロッド側室と前記ロッド内空間との間で作動流体を導く第1連通路と、前記ロッド内空間と前記減衰部との間で作動流体を導く第2連通路と、が形成され、
前記ピストンロッドは、前記ロッド内空間に収容され前記ボトム側室と前記減衰部との間で作動流体を導く流路部をさらに有する流体圧緩衝器。 - 請求項1又は2に記載の流体圧緩衝器であって、
前記減衰部は、それぞれ作動流体の流れに対して抵抗を付与する第1抵抗部及び第2抵抗部を有し、
前記第1抵抗部は、前記ロッド側室及び前記ボトム側室の一方から他方に向かう作動流体の流れに対してのみ抵抗を付与する流体圧緩衝器。 - 請求項1又は2に記載の流体圧緩衝器であって、
前記減衰部は、通過する作動流体の流れに付与する抵抗が可変の可変絞り部を有する流体圧緩衝器。 - 請求項1又は2に記載の流体圧緩衝器であって、
前記減衰部は、
作動流体に付与する抵抗がポジションに応じて変化する減衰弁と、
前記ピストンロッドが前記シリンダチューブ内に進入するのに伴って前記シリンダチューブに押圧されて前記減衰弁のポジションを切り換える切換部と、を有する流体圧緩衝器。 - 請求項1又は2に記載の流体圧緩衝器であって、
前記減衰部は、
作動流体に付与する抵抗がポジションに応じて変化する減衰弁と、
通電によって駆動されて前記減衰弁のポジションを切り換えるソレノイド部と、を有する流体圧緩衝器。
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US18/550,900 US20240157752A1 (en) | 2021-03-23 | 2022-03-15 | Fluid pressure dumper |
EP22775262.3A EP4317737A1 (en) | 2021-03-23 | 2022-03-15 | Fluid pressure shock absorber |
CN202280022545.5A CN116997732A (zh) | 2021-03-23 | 2022-03-15 | 流体压力缓冲器 |
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JP2021049215A JP2022147805A (ja) | 2021-03-23 | 2021-03-23 | 流体圧緩衝器 |
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WO2023171507A1 (ja) * | 2022-03-08 | 2023-09-14 | Kyb株式会社 | 流体圧緩衝器 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0369837A (ja) * | 1989-08-09 | 1991-03-26 | Tokico Ltd | 油圧緩衝器 |
JP2015063998A (ja) * | 2013-09-24 | 2015-04-09 | カヤバ工業株式会社 | 緩衝器及び懸架装置 |
JP2015206374A (ja) | 2014-04-17 | 2015-11-19 | カヤバ工業株式会社 | シリンダ装置 |
JP2020097997A (ja) * | 2018-12-18 | 2020-06-25 | Kyb株式会社 | 流体圧緩衝器 |
JP2021049215A (ja) | 2019-09-26 | 2021-04-01 | パナソニックIpマネジメント株式会社 | ドラム式洗濯機 |
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2021
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2022
- 2022-03-15 CN CN202280022545.5A patent/CN116997732A/zh active Pending
- 2022-03-15 EP EP22775262.3A patent/EP4317737A1/en active Pending
- 2022-03-15 US US18/550,900 patent/US20240157752A1/en active Pending
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0369837A (ja) * | 1989-08-09 | 1991-03-26 | Tokico Ltd | 油圧緩衝器 |
JP2015063998A (ja) * | 2013-09-24 | 2015-04-09 | カヤバ工業株式会社 | 緩衝器及び懸架装置 |
JP2015206374A (ja) | 2014-04-17 | 2015-11-19 | カヤバ工業株式会社 | シリンダ装置 |
JP2020097997A (ja) * | 2018-12-18 | 2020-06-25 | Kyb株式会社 | 流体圧緩衝器 |
JP2021049215A (ja) | 2019-09-26 | 2021-04-01 | パナソニックIpマネジメント株式会社 | ドラム式洗濯機 |
Cited By (1)
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WO2023171507A1 (ja) * | 2022-03-08 | 2023-09-14 | Kyb株式会社 | 流体圧緩衝器 |
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US20240157752A1 (en) | 2024-05-16 |
JP2022147805A (ja) | 2022-10-06 |
EP4317737A1 (en) | 2024-02-07 |
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